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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e606aa3ed5cc3565e6146fbb4817fad41f9cf3a1a7a8bdbfb1d7b8427b172975' 
  AND token = '2qoqzxF/pavwH/Lh0H4fHuoRhefVAfbblbc9UnxUzNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}